There was more alarming news. Use of illegal drugs, including cocaine, marijuana, and opioids by pregnant women increased significantly between 2015 and 2017. About 7 percent of pregnant women reported using marijuana. Three percent said they used it daily.

I'm here to tell you this is not a safe drug," McCance-Katz said during a town hall event at "NatCon18," the National Council for Behavioral Health's annual conference.
"Americans have a right to know that and we should be telling them that," she continued.
And while tobacco and alcohol rates have declined among pregnant women in recent years, illicit drugs -- mainly marijuana but also opioids -- have increased from 78,000 women in 2015 to 111,000 in 2016, she said.
On the contrary, "marijuana use was associated with substantially increased risk of addiction and overdose for opioids," she said, citing research from Mark Olfson, MD, MPH, and colleagues in the American Journal of Psychiatry.